"9999-12-31T23:59:00Z" not parsing as valid ISO 8601 DateTime

I have a template with a setting ( which was exported from Azure Resource Manager btw.) I don’t believe this warning is valid as that is a valid iso datetime as far as I can tell. I’m not sure about the string type error.

{
	"resource": "/c:/Projects//powershell/ServicePlan-Template.json",
	"owner": "ARM Template Language Server diagnostics",
	"severity": 4,
	"message": "Value must conform to exactly one of the associated schemas\r\n|   Value must be a valid ISO 8601 datetime at #/resources/1/properties/siteConfig/requestTracingExpirationTime\r\n|   or\r\n|   Value must be one of the following types: string",
	"source": "arm-template (schema)",
	"startLineNumber": 138,
	"startColumn": 11,
	"endLineNumber": 138,
	"endColumn": 23
}

Section from Template

            ...
            "numberOfWorkers": 1,
            "defaultDocuments": [],
            "netFrameworkVersion": "v4.0",
            "requestTracingEnabled": true,
            "requestTracingExpirationTime": "9999-12-31T23:59:00Z",
            "remoteDebuggingEnabled": false,
            "httpLoggingEnabled": true,
            "logsDirectorySizeLimit": 35,
            ...

[vllama]

Github_template.json.txt

Here is the template

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